Andal BaluExcerpt from the discussion in forum hub.
If you use just Basmati rice and urad, the idlis will not come good. They will be sticky and hard. You need to use the idli rice to get good idlis.
If you have a grinder use 5 cups of idli rice and 1 cup of urad dhal. IF you have only a blender, use 3 cups of rice and 1 cup of urad dhal.
To read full discussion and tips, please access the original site through this link – fail proof Idli recipe in forum hub